[fix] Fix missing fields in xqa kernel cache key #6282

lowsfer · 2025-07-23T07:01:30Z

Summary by CodeRabbit

New Features
- Enhanced runtime configuration to optionally account for position embedding type, improving flexibility in certain scenarios.
Bug Fixes
- Improved uniqueness and accuracy of runtime hash keys for better handling of model variations.
Refactor
- Updated internal logic to support the new optional parameter without affecting existing workflows.

coderabbitai · 2025-07-23T07:01:38Z

📝 Walkthrough

Walkthrough

The changes extend the XQAKernelRuntimeHashKey struct by adding an optional position_embedding_type field. Associated equality and hash functions are updated accordingly. The construction of this hash key is modified in all relevant places, including JIT and precompiled kernel implementations, to include the new optional field and adjust related parameters.

Changes

File(s)	Change Summary
Core common implementation `cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplCommon.cpp`	Modified `getRuntimeHashKeyFromXQAParams` to conditionally include `position_embedding_type` in the returned struct.
Core common header `cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplCommon.h`	Added optional `position_embedding_type` to `XQAKernelRuntimeHashKey`, updated equality operator and hash calculation.
JIT kernel implementation `cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp`	Updated `getRuntimeHashKeyFromKernelMeta` to add the new optional field and modify `is_fp8_output` parameter type in hash key construction.
Precompiled kernel implementation `cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplPrecompiled.cpp`	Updated `XQAKernelRuntimeHashKey` construction in two locations to append `std::nullopt` for the new optional field and replace `0` with `false` for `is_fp8_output`.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant XQAParams
    participant HashKeyBuilder
    participant HashTable

    Caller->>HashKeyBuilder: getRuntimeHashKeyFromXQAParams(xqaParams, isXqaJit)
    HashKeyBuilder->>XQAParams: Access parameters
    alt isXqaJit == true
        HashKeyBuilder->>HashKeyBuilder: Set position_embedding_type = xqaParams.position_embedding_type
    else
        HashKeyBuilder->>HashKeyBuilder: Set position_embedding_type = nullopt
    end
    HashKeyBuilder->>HashTable: Use hash key (with optional position_embedding_type)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

fix precompiled multi_query_token kernel not having is_fp8_out hash key #6279: Related to extending the XQAKernelRuntimeHashKey with additional optional fields, focusing on the is_fp8_output flag for precompiled kernels; complements this PR by addressing different fields within the same hashing mechanism.

Suggested reviewers

lucifer1004
kaiyux

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📥 Commits

Reviewing files that changed from the base of the PR and between 2144ecd and 3be47f8.

📒 Files selected for processing (4)

cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplCommon.cpp (1 hunks)
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplCommon.h (2 hunks)
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp (1 hunks)
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplPrecompiled.cpp (2 hunks)

🚧 Files skipped from review as they are similar to previous changes (4)

cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplJIT/decoderXQAImplJIT.cpp
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplPrecompiled.cpp
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplCommon.h
cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplCommon.cpp

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lowsfer · 2025-07-23T07:35:08Z

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tensorrt-cicd · 2025-07-23T07:37:54Z

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lowsfer · 2025-07-25T02:45:33Z

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Signed-off-by: Yao Yao <lowsfer@users.noreply.github.com>

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lowsfer · 2025-07-29T04:02:52Z

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tensorrt-cicd · 2025-07-29T04:08:24Z

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cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplPrecompiled.cpp

lowsfer · 2025-07-31T08:37:58Z

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tensorrt-cicd · 2025-07-31T08:44:20Z

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Signed-off-by: Yao Yao <lowsfer@users.noreply.github.com> Signed-off-by: Lanyu Liao <lancelly@users.noreply.github.com>

Signed-off-by: Yao Yao <lowsfer@users.noreply.github.com>

lowsfer requested review from a team as code owners July 23, 2025 07:01

lowsfer requested review from Superjomn, dongxuy04 and symphonylyh July 23, 2025 07:01

lowsfer changed the base branch from main to release/0.21 July 23, 2025 07:01

lowsfer requested a review from a team as a code owner July 23, 2025 07:01

lowsfer force-pushed the fix-xqa-key branch from b7cb8db to 943bb3f Compare July 23, 2025 07:32

lowsfer changed the base branch from release/0.21 to main July 23, 2025 07:32

lowsfer force-pushed the fix-xqa-key branch from 943bb3f to 2144ecd Compare July 23, 2025 07:34

NVIDIA deleted a comment from tensorrt-cicd Jul 23, 2025

nv-yilinf mentioned this pull request Jul 23, 2025

[https://nvbugs/5398180][feat] Improve Llama4 performance for small max_seqlen cases #6306

Merged

[fix] include rope style in XQA kernel cache key

3be47f8

Signed-off-by: Yao Yao <lowsfer@users.noreply.github.com>

lowsfer force-pushed the fix-xqa-key branch from d36ffce to 3be47f8 Compare July 28, 2025 06:30

coderabbitai bot requested review from kaiyux and lucifer1004 July 28, 2025 06:31

symphonylyh requested a review from jhaotingc July 29, 2025 01:41

symphonylyh approved these changes Jul 29, 2025

View reviewed changes

cpp/tensorrt_llm/kernels/decoderMaskedMultiheadAttention/decoderXQAImplPrecompiled.cpp Show resolved Hide resolved

lowsfer merged commit 942e080 into NVIDIA:main Aug 1, 2025
3 checks passed

lancelly pushed a commit to lancelly/TensorRT-LLM that referenced this pull request Aug 6, 2025

[fix] Fix missing fields in xqa kernel cache key (NVIDIA#6282)

c38aaad

Signed-off-by: Yao Yao <lowsfer@users.noreply.github.com> Signed-off-by: Lanyu Liao <lancelly@users.noreply.github.com>

jain-ria pushed a commit to jain-ria/TensorRT-LLM that referenced this pull request Aug 7, 2025

[fix] Fix missing fields in xqa kernel cache key (NVIDIA#6282)

0b1ed2f

Signed-off-by: Yao Yao <lowsfer@users.noreply.github.com>

[fix] Fix missing fields in xqa kernel cache key #6282

[fix] Fix missing fields in xqa kernel cache key #6282

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